Baseline valid for all curves or only for a certain curve?

Hello,

could you tell me whether setting the baseline has influence on all curves or only on that curve to which I set this baseline? I have noticed that the brushed area under/above curves does not fit allways to my settings, that is the reason why I'm asking here.

best regards,

Vitali

Code:

int k=0;
		for( std::map<QString, complex<double> (*)(complex<double>)>::iterator ii = optProbList[index]->constraints.begin(); ii!= optProbList[index]->constraints.end(); ++ii)
			   {
	    //=========================== plot the constraint curves
	    // add curves
	    QwtPlotCurve *curve1 = new QwtPlotCurve();
 
	        curve1->setPen(QColor(Qt::red));
	        curve1->setStyle(QwtPlotCurve::Lines);
	        curve1->setCurveAttribute(QwtPlotCurve::Fitted);
	        curve1->setBrush(QBrush(Qt::black, Qt::FDiagPattern));
 
	       if(equality[k]<0){
	    	   curve1->setBaseline(rangex2[1]);
	       }
	       else if(equality[k]>0){
				curve1->setBaseline(rangex2[0]);
			   }
	       else{
	    	   curve1->setBrush(QBrush(Qt::NoBrush));
	       }
	    // copy the data into the curves
	    //
	    curve1->setData(SimpleData((*ii).second, rangex1, rangex2, 0.05));
 
	    curve1->attach(this);
	    //=========================== end of plot the constraint curves
			k= k+1;
			   }